Michael Griebel, Marc Alexander Schweitzer. A Particle-Partition of Unity Method-Part III: A Multilevel Solver. SIAM J. Scientific Computing, 24(2):377-409, 2002. [doi]
@article{GriebelS02,
title = {A Particle-Partition of Unity Method-Part III: A Multilevel Solver},
author = {Michael Griebel and Marc Alexander Schweitzer},
year = {2002},
doi = {10.1137/S1064827501395252},
url = {http://dx.doi.org/10.1137/S1064827501395252},
researchr = {https://researchr.org/publication/GriebelS02},
cites = {0},
citedby = {0},
journal = {SIAM J. Scientific Computing},
volume = {24},
number = {2},
pages = {377-409},
}